Over the past 5 years Matthew Harris has been doing some interesting research into feather morphogenesis, and he has produced some must watch videos. His work on quantitative modeling of development via the activator-inhibitor system is, I believe, a necessary precursor in fruitfully talking about the evolutionary context of feathers. To my mind the videos are essential for anyone who isn't fluent in molecular developmental biology (like me), so we can have the big picture in mind when digging through the essential details.
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